Detection of the Stuck-at-0 faults (SA0) on 4x16 decoder

Stuck at fault are of how many types
SA0 fault detection model is used to
IC chip used for implementation of 3x8 line-decoder
The 4x16 line-decoder implemented using two 3x8 line-decoders has enable as
By considering Stuck-at-0 fault (line always passes signal 0) at different locations, all the SA0 fault cases can be identified